Review Issue Reports for a Scrum Board

The Reports view in a scrum board provides several different kinds of reports:

This Kind of Report	Displays ...
Burndown chart	The amount of unfinished work in a sprint or in an epic
Cumulative Flow chart	The total number of issues in each of the board's progress states, over time
Control chart	Information about an issue’s progress state change events on the timeline
Sprint report	A sprint's complete, incomplete, and open issues
Epic report	An epic's complete, incomplete, and open stories
Velocity report	A velocity chart for completed sprints

See Review Agile Reports and Charts.